Setting & Retrieving CGI Parameters

You can set and retrieve CGI parameters easily. In these examples, the CGI field string is:

banana=yellow&squash=green&tomato=red&tomato=green

Retrieve a Single-Valued Field Named "Tomato":

my $banana_color = param('banana'); # yields "yellow"

This works for both GET and POST types, including multipart/form-data.

Retrieve a Multi-Valued Field Named "Tomatoes":

Call param() with the name of the field and assign it to an array:

my @tomatoes = param('tomato'); # yields ('red','green')

Finding out What Parameters are Available

Call param() without any arguments. Will return the names of each of the parameters:

my @fields = param; # yields ('banana','squash','tomato')

Setting Single- and Multivalued Fields:

  param(-name=>'tomato',  -value=>'red');
  param(-name=>'tomatoes',-value=>['red','green','blue']);

Parameters set in this way will be used as default values for fill-out form fields and hidden fields.

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